Centrifugal impact pulverizer



July 12, 1927.

F. E. AGNEW CENTRIFUGAL IMPACT PULVERIZER Filed Dec. 9. 1925 2Sheets-Sheet 1 i a July 1927' F. E. AGNEW 635 453 CENTRIFUGAL IMPACTPULVERIZER Filed Dec. 9.1925 2 Sheets-Sheet z Patented July 12, 1927.

UNITED STATES PATENT OFFICE.

FRANCIS E. AGNEW, OF HUNTINGTON PARK, CALIFORNIA, ASSIGNOR TO MINERVA A.

BROTHERTON, OF SANTA BARBARA, CALIFORNIA.

CENTRIFUGAL IMPACT PULVERIZER.

My invention relates to centrifugal impact pulverizers and consists ofthe novel features herein shown, described and claimed. An object of ininvention is to make a 5 centrifugal pulverizer having a plurality ofimpellers upon a single vertical shaft, so

that the material will pass downwardly from one impeller to another.

Another object of my invention is to make 1 a centrifugal pulverizerhaving a vertical impeller shaft extendingthrough the pulverizingchamber and to provide an improved end thrust' bearing and dust excluderfor the bearing.

Other objects and advantages will appear from the drawings andspecification.

The drawings illustrate the invention.

Figure l is a vertical diametrical sectional detail of a centrifugalimpact pulverizerembodying the principles of my invention, the Viewbeing taken on the line l-l of Fig. 2 and looking in the directionindicated by the arrow. A Fig. 2 is a horizontal cross section on the Lline 2- -2 of Fig. 1. V

Fig. 3 is an enlarged vertical diametrical sectional detail on the line3-3 of Fig. 1.

The details of the centrifugal impactpulverizer are as follows:

A discharge hopper 1 is circular in plan at its upper end and has aperipheral flange 2 extendingall the way around. The base 3 is anannular flange fitting upon the flange 2 and the two flanges areconnected by cap screws 4. Supporting plates 5 and 6 extend from theflange 3 at diametrically 0pposite sides and have supporting ribs 7 and8. The plates 5 and 6 are adapted to rest upon a suitable foundation forsupporting the pulverizer and have bolt holes 9 and 10 for attaching theplates to the foundation.

The bearing block 11 is formed as an integral part of the dischargehopper 1. The

. wall 12 extending downwardly from the flange 2 is funnel shaped, thefunnel being mutilated to produce a discharge opening 13 at one side ofthe bearing block 11 and forms a collecting chamber 14. The extensionbearing block 15 extends upwardly from the bearing block 11 into thechamber 14. A circular bore 16 is formed from the lower face of thebearing block 11 and an oil port 17 leads from the outer face of thebearing block 11 into the upper end of the bore 16,

the outer end of the port 17 being closed by a removable plug 18.

The thrust bearing assembly 19 is inserted upwardly into the bore 16 andhas a flange 20 fitting against the end of the block 11 and is held inplace by cap screws 21. A bore 22 is formed from the upper end of theextension block 15 down to a shoulder 23 and a smaller bore 24 leadsfrom the shoulder 23 to the bore 16. An inner tube 25 is fixed in thebore 24 and extends to the top of the bearing block 15. The impellershaft 26 extends downwardly loosely through the tube 24 and the thrustbearing member 27 is fixed upon the lower end of the shaft 26 before theassembly 19 is mounted in the bore 16.

The upper end of the block 15 is finished to make an offset shoulder 28.The set collar 29 has a bore 30 to receive the shaft 26 and an enlargedbore 31 to receive the tube 32. The collar is rigidly mounted upon theshaft 26 by set screws 33 or the like and the tube 32 extends loosely inthe bore 22 and loosely around the tube 25 to near the shoulder 23. Thelower face of the set collar 29 is counterbored to make an end ring 34cooperating with the offset shoulder 28 to make a staggered jointbetween the collar 29 and the bearing block 15 and this staggered jointwith the tubes 32 and 25 operating in oil or grease serves to excludethe pulverizeddust of the chamber 14 from the thrust bearing 19.

The casing 35 is formed integral with the base 3 and extends upwardlyand has an annular flange 36 around its upper end. The casing 35 andbase 3 mounted upon the flange 2 leaves an annular shoulder 37 at thetop of the hopper 1. The casing 35 is circular in plan and forms acircular chamber 38. The cylindrical breaker or impact plate 39 fits inthe lower end of the casing 35 upon the shoulder 37 and has a corrugatedinner face 40. The plate 39 is preferably made of manganese steel. Theintermediate portion 41 of the shaft 26 is hexagonal in cross section.

The impeller disc 42 has a hub 43 with a bushing 44 cast into the huband fitting the hexagonal portion 41 of the shaft. culai' web 45 extendsoutward from the lower end of the hub 43 and straight inipeller blades46 extend in a radial direction The cirplate 39. The spacing sleeve 48fits upon:

the hexagonal portion of the shaft 26 against the hub 43. Thesecond'impeller 49 fits upon the shaft 26 against the'sleeve 4-8. Thai-alpacaplate50'fit's in tlie' shell 85 upon the funnel 47, v in the shell 35against the impact plate" 50. The second sleeve 52 fits upon the shaft26 against the impeller 49. The third impactplate' 53" fits i'n theshell 35 against the tunnel' 51 The thir'cliimpeller 54: comprising adisc having impeller blades fits upon the shaft 26 against the sleeve5:2 The third funnel 55" fits in the' shell 35 against the- Sc-rewthreads 56 are impact plate' v formed upon theshaft 26 above theimpeller 56F and jam b nuts" 57 and 58" fit upon the threads 56 againstthe' l-iub of the impeller 5 L to"tightenfthe impellers against the saidcollar 29.- K-plttte 59 fitsin the shell'35 against the top of thetunnel 55 and has a central openiiig through; which the" shaft 26e'ziten ds and lias a second opening through which the feed spout GOeXtends. The cap ring 6i tits upon the annula'r' flange, 36 andSllglifly v laps the edge of the plate 59 and is held inplace by capscrews 62'. The poftion' 63 of the shaft 26* aho've the threads 56is'round and smooth and a" belt pulley er is secured upon this portion ofthe shaft above the cap ring 61; z I

A f-ins 65 extendupwardly and inwardly from the ring (Bland-abearingblock 66 is rahhea integral with the upper ends" of the arms 65.The feed spout (SO-has a'- fun nel shapeduppr end 66' and is insertedthIoug-h one of the arms 65 and through the plate 59 to discharge thematerial tothe funnel 5 5 aha to theupperiinpell'e'r '54,

that being a flange 67" eX-tehai g fromthe the spout Securely in place.-The chamber" 68" is foiiild from the upper end of the bearing "hlhli 66and the hall hearing as senibly 69- is' mounted in this chamber arouhdand-'upoii" the upper end of the shaft 26" and a cap 7 0' is secured tothe bearing block by capscrews 71th cover" the bearing 69; The drivingbelt 72 passes around the pulley 6 lgone flight-ofthe" belt being onoiie side of the arm 65 arid-the other'fiight" on the other side.

The centrifugal impact pulvriz' r thus constructed is adapted topulverize lime"- stone; talc, quartz; ores; and the'lik'e, toproduceva-rious mineral )roducts, and'the' ma tcrial to 'be pulvehizetlis broken intocord paratively small pieces and continuously fed Thesecond funnel 51- fits through the spout 60 and funnel 5 to the impeller54'f-r0m which it is discharged against of the impeller 49 and is againthrown against the impact I plate 50 arid passes downwardly through thefunnel l7 to the central portionofthe impeller 42 and is again thrownagainst the impact plate 39 and passes downwardly to the chamber 14: andis discharged through the passage 13. or course the impellers are to beoperated at a high rate of speed and the successive impeller actionswill reduce suitable ore of other material to a fine' powder and if allof the material is not s'ufli'ci-ently reduced it may be separated andrun through the machine" again:

Thus I have made a centrifugal impactpulver'izer,- comprising adischarge hopper ha-ving a central bearing block and adischarge openingat one sideof the barnigl block, an impel-le'rshaft mounted' i-n athrust bearing 1n the bearing block, means for ex eluding dust from thethrust bearing-a shell mountedupon the hopper,- an impact plate mountedin the shell, an impeller mounted upon the s'ha' tt to discharge againstthe imact plate; dfu'nnel' mounted in the shell upon the impact pla'te'and forminga pul-' verizingunit,therebeing a plurality of saidpulverizingunits in the shell and upon the shaft above tlie'firstunit,and a discharge spout leading to the top unit,-- so; that the materialwill pas's'irom one" impeller unit to the next and then to the dischargehopper-.-

Var'iou's' changes may bema'de witho ut d epartin claimedi- I claim:

1.- A centrifugal inlpa'ct" pulveri'zer (ionia discharge hopper havingweer-112ml bearing block andadi-scha-rg e opening at one side 01 thebear-ih' block, a vertical impeller shaft mounted in thrust- Bearih inthe bearing block, a vertical ,shellinounted upon the hopper, acylin'clriealimpact plate mounted in" the shell; an impeller having' ahon zont'a'l discwith radial; I vertical blades at its outer" edgespaced from the shaft mounted upon" the shaft to discharge against theinrpact' plate, a funnel; rnotinted in the shell upon the i in-pactplate discharging" near the center of the; disc, said impact-plate,impellerand funnelforming a" puiverizihg uhia therebeing a plurality ofsaitlpulv'eriz' ing' unitsflin tll sheik above the lOWeSIi' uiiit, and adis charge spout-"leading to the top unit's'oth'at material will passfrom one impeller unit to the next and thento the discharge happen 2-111a-centrifugal" impact pulverize'r', at vertical she'll; a veitical'impeller shaft in the shell; ah im eller u'pon'flthe" shaft havinghori'z'ontal d'isc withbladhs adjacent its'outer edge, an impact platein the shell iii thefrom the spirit of my invention as g plane of theimpeller, a funnel in the shell discharging to the impellersubstantially inside the blades, a second similar impeller upon theshaft upon the funnel, a second similar impact plate in the shell in theplane of the second impeller, and means for discharging material to thecentral portion of the second impeller.

3. A centrifugal impact pulverizer comprising in combination a verticalshell hav ing a series of cylindrical breaker rings therein, a verticalshaft having a series of fiat horizontal impeller discs mounted thereon,vertical impeller blades mounted on some of the discs adjacent theirouter edges, and a series of funnel-like constructions to feed materialfrom the outer periphery of an upper impeller disc to the centralportion of an impeller disc there next below.

4. A centrifugal impact pulverizer comprising in combination a verticalshell having a series of stationary cylindrical breaker rings therein, avertical shaft having a series of horizontal impellerdiscs mountedthereon, impeller blades mounted on some of the discs and a series ofhopper-like constructions adapted to feed material from the outerperiphery of an upper impeller disc to the central portion of animpeller disc there next below.

5. A centrifugal impact pulverizer comprising in combination a verticalshell havon the shaft, impeller blades ext-ending upwardlyfrom thesurfaces of the discs adjacent the periphery of the discs and spacedfrom the center, said blades being adapted to throw material radiallyoutwardly against the breaker rings, a hopper at the top of the shell,and a series of secondary hoppers inclined inwardly from the breakerrings towards the center of the impeller discs, adapted to dischargematerial on said discs inside the impeller blades.

6. In a centrifugal impact pulverizer, a vertical shell having a breakerring, a ver tical shaft, an impeller disc mounted thereon, a pluralityof impeller blades extending vertically and radially outwardly of saiddisc adjacent its periphery and spaced from its center, a hopper-likestructure positioned above the disc, havinoa discharge above the discadjacent the shaft and radially inwardly of the impeller blades.

7. In a centrifugal impact pulverizer, a vertical shell, a stationarycylindrical breaker ring mounted therein, a central vertical shaft witha horizontal impeller disc thereon, a plurality of impeller blades, suchblades extending upwardly from the disc adjacent its periphery, andbeing positioned in a radial direction, the inner edge of the bladesbeing spaced from the shaft, and a hopper positioned above the disc,having a discharge on to the disc radially inwardly of the inner edgesof the impeller blades.

In testimony whereof I have signed my name to this specification.

FRANCIS E. AGNEW.

